US3837854A - Photographic color process based on controlled flow of silver ions - Google Patents

Photographic color process based on controlled flow of silver ions Download PDF

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Publication number
US3837854A
US3837854A US00280426A US28042672A US3837854A US 3837854 A US3837854 A US 3837854A US 00280426 A US00280426 A US 00280426A US 28042672 A US28042672 A US 28042672A US 3837854 A US3837854 A US 3837854A
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layer
silver halide
emulsion
color
layers
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US00280426A
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English (en)
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B Waxman
R Shannahan
F Viro
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GAF Corp
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GAF Corp
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Priority to US00280426A priority Critical patent/US3837854A/en
Priority to CA176,132A priority patent/CA998553A/en
Priority to GB3417973A priority patent/GB1440091A/en
Priority to IT27840/73A priority patent/IT998358B/it
Priority to JP48090817A priority patent/JPS5041535A/ja
Priority to DE19732340889 priority patent/DE2340889A1/de
Priority to FR7329740A priority patent/FR2196483B1/fr
Priority to BE134575A priority patent/BE803606A/xx
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Publication of US3837854A publication Critical patent/US3837854A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/02—Photosensitive materials characterised by the image-forming section
    • G03C8/04—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals
    • G03C8/045—Photosensitive materials characterised by the image-forming section the substances transferred by diffusion consisting of inorganic or organo-metallic compounds derived from photosensitive noble metals with the formation of a subtractive dye image

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  • ABSTRACT Positive multicolor images are produced by exposing, developing with a black-and-white developer, washing and then treating with an alkaline processing solution containing a paraphenylene diamine or other color producing developer and minute quantities of silver halide solubilizing agents a film package constructed of emulsion layers backed by color providing layers containing nucleating species and color providing couplers designed to react in said color providing layers with oxidized color developer produced by the catalytic reduction of solubilized silver ions in areas corresponding to unexposed portion of the film package.
  • a separation layer which impedes the flow of silver ions from one emulsion layer to any layer other than the layer providing color complementary to the sensitized layer.
  • Quantities of silver halide solvent are selected to assure a proper solubilization rate coupled with a rapid physical development effecting a sink condition whereby the nucleating layers pull silver ions of unexposed silver halide grains from adjoining layers only to produce colors complementary to the sensitization of the respective emulsion layers.
  • the silver ion diffusion or silver stream system is best known as the process upon which the black-andwhite Polaroid film is based.
  • the silver stream requires reduction of exposed silver halide and solubilization of unexposed silver halide grains in the negative portion of the package with a simultaneous migration of the solubilized species to a receiving layer where incorporated nuclei catalyze reduction, and the formation of a positive image.
  • Muessen et al. US. Pat. No. 2,673,800 illustrates diffusion fast cyan, magenta, and yellow color formers in separation layers adjacent to the red, green and blue light sensitive silver halide emulsion layers respectively, these coupling with oxidized developer to provide the subtractive colors necessary for multicolor reproductions.
  • metallic nuclei As a catalyst for the reduction of the complexed silver ions, metallic nuclei, or metallic sulfides have been suggested. The effectiveness of these catalysts is dependent on their concentration and the thickness of the layers in which they are contained. Barrier layers containing metallic nuclei, sulfides, complexing agents, etc., have also been described in order to control the flow of errant silver ions and retard color contamination.
  • thermodynamic concept of chemical potential which is to entropic force fields what electromotive force is to electric force fields; just as mass transfer (i.e., silver ion transfer) is to entropic force fields what current or electron movement is to electric force fields.
  • thermodynamic argument details the difference between solvent induced silver ion transfer in prior art systems and reaction aided silver ion transfer in these systems.
  • the former is characterized by high silver halide solvent concentrations, sufficient to move silver halide throughout the system with no bearing on the intended reaction site, leading to ghost images.
  • the latter is characterized by sufficiently low solvent concentrations to afford the sink potential of the reaction site to play a significant role in the mass transfer of silver ions, the nearby reaction sites having a distinctively larger effect than those more remote.
  • This mode of intranegative transfer allows for design to limit silver ion transfer to desired intranegative transfers without the acceptance of undesirable intranegative transfers as a penalty.
  • the parameters defining the reactionaided transfer mode for a given system and silver solvent are not independent of each other, and such mode of transfer is not a function of any one of them.
  • a low silver solvent concentration of 2 grams/liter might be characteristic of the low levels employed in our invention, a too thin dividing layer between the silver source and an unwanted reaction site might have the effect of triggering an unwanted transfer.
  • the distance parameter is set, and a silver concentration is found which lies below the dividing line between these two modes of transfer. This value will, of course, be different for different silver solvents.
  • the intranegative transfers will be limited to the following three, without complicated means being required to bar other undesirable intranegative transfers: the undeveloped silver halide from the blue record will transfer specifically and solely to the adjacent reactionproviding layer affording a positive yellow image therein; and the undeveloped silver halide from the green record will transfer specifically and solely to the adjacent reaction-providing layer affording a positive magenta image therein; and the undeveloped silver halide from the red record will transfer specifically and solely to the adjacent reaction-providing layer affording a positive cyan image therein.
  • the net effect of the three operative intranegative silver transfers only is a composite dye image yielding a true rendering of the variations in hue, saturation and density of the original scene.
  • the range of 0. l to 0.5 grams/liter of sodium thiosulfate may be specific for a given emulsion, it is an essential point of the present invention that for any given emulsion the rate of solubilization of the unexposed silver halide grains must be dependent on the nucleating ability of the adjacent layers to catalyze their reduction. If, for example, the emulsion tested is coated with a gel separation layer between it and the nucleating layer, it should be found, assuming the proper amount of thiosulfate salt is used, that decreasing rates of solubilization and hence, color formation, is observed when the gel separation is increased from zero to 5.0 microns dry thickness. With a 5.0 microns thick separation layer, little or no nucleation should occur during the time that complete color saturation would occur in the samples without separation layers.
  • FIG. 1 represents a package by which the practice of our invention may lead to a positive three color reproduction of the original scene.
  • the figure shows the package during the exposure stpe.
  • FIG. 2A shows in detail the photosensitive member 2, 5, and/or 8 of FIG. I in one embodiment of our invention.
  • FIG. 2B shows in detail the photosensitive member 2, 5, and/or 8 of FIG. I in a second embodiment of our invention.
  • FIG. 3 shows the package in FIG. 1, as practiced in the first embodiment, after black and white development and prior to color development.
  • FIG. 4 shows the package in FIG. 1, as practiced in the first embodiment, during the intranegative transfers of silver ions.
  • the arrows indicate only the intranegative transfers allowed by the proper practice of our invention.
  • FIG. 5 shows the package in FIG. 1, as practiced in either embodiment, after the bleach and fix step.
  • FIG. 6 shows the structure of some color formers useful in the practice of the invention. I, II and III are typical of those used in either embodiment and IV is typical of the white coupler, the concept of which will be de scribed later, useful to the second embodiment.
  • FIG. I and to FIG. 2A represent in detail the structure of silver halide members 2, 5, and 8 from FIG. 1 in this first embodiment, namely a single layer, 10, of silver halide emulsion sensitized to the red portion of the spectrum when representative of 2; the green portion of the spectrum when representative of 5; and limited to its inherent natural blue sensitivity when representative of 8.
  • the photosensitive package for the first embodiment is coated as shown in FIG. 1 on layer 1, which is a support base and can be either a film base such as polyester or thermoplastic cellulose film base material or baryta coated paper or polyethylene-laminated-paper base, which base is prepared for the silver halide gelatin or colloid coating by a surface preparation known in the art as subbing.
  • layer 1 is a support base and can be either a film base such as polyester or thermoplastic cellulose film base material or baryta coated paper or polyethylene-laminated-paper base, which base is prepared for the silver halide gelatin or colloid coating by a surface preparation known in the art as subbing.
  • Layer 2 is an element described by FIG. 2A as explained above for this embodiment and serves as the red recording layer.
  • Layer 3 is a gelatin or gelatin substitute matrix containing development nuclei such as colloidal particles of noble metal or noble metal sulfides, but preferably, a colloidal dispersion of silver metal particles of a size such that they may act as a yellow filter during exposure and as development nuclei promoting color physical development in the presence of unreduced silver ions representing the positive record of, and coming from the immediately adjacent silver halide layer.
  • This layer also contains a cyan forming non-diffusible color former, such as, but not limited to, color former I in FIG. 6.
  • Layer 4 plays the color providing role for layer 5, just as layer 3 does for layer 2 and is so constituted as layer 3 except that in place of a cyan providing color former, a non-diffusible magenta providing color former is included such as, but not limited to, color former II in FIG. 6.
  • This layer is of 3 to 6 microns thickness so as to provide, co-jointly with its operation as a color providing layer, the spacing requirements between the independently acting color providing elments learned from the above explained teachings of our invention.
  • the preferred embodiment does serve to maximize the color response of the green record, which color is most important to the impressions made on the human retina by the composite dye image, so that the co-joint action of layers 4 and 6, said layers being identically constituted, is preferable tothe replacement of any one of them by an inert gelatin layer of 3-6 microns thickness.
  • Layer 5 is an element as described before for FIG. 2A for this embodiment and serves as the green recording layer.
  • Layer 6 is identical and equal in role to layer 4.
  • Layer 7 plays the color providing role for layer 8, just as the other color providing layers act only with their companion silver halide layers, and is so constituted, except insofar as it contains a non-diffusible yellow forming color former such as, but not limited to, color former III in FIG. 6.
  • Layer 8 is an element as described before by FIG. 2A for this embodiment and serves as the blue recording layer.
  • Layer 9 is a thin layer of hardened gelatin which serves to protect both the unexposed photosensitive package and the fully processed positive color reproduction against abrasive action. This layer may also contain one of many U.V. absorbers well known to the art.
  • FIG. 1 in addition to describing the several strata of the photosensitive package of the first embodiment (along with FIG. 2A) shows the action of light in registering the color of incident light by providing developable latent image in the proper layer of the exposed area.
  • the exposed photosensitive package is first developed in any black and white developer or combination of these developers, converting the light struck silver as shown in FIG. 1 into metallic silver as shown in FIG. 3. This, in effect, removes such light struck silver halide from playing a role in the next step, and provides a positive record of the exposure action in terms of undeveloped silver halide.
  • the next step in this first embodiment consists of a physical development in an alkaline processing solution containing at least a p-phenylene diamine type color developer and a silver halide solvent such as thiosulfate in aconcentration of below 10 grams/liter but preferably below 2 grams/liter, but especially at that critical concentration which by experiment, as described heretofore, provides only reaction aided silver ion transfer when used in combination with the distance parameters inserted into the package in the thicknesses of layers 4 and 6.
  • a silver halide solvent such as thiosulfate
  • the reaction with this color developer is not one of the development of the non-latent-image bearing silver halide grains left over from the first development but rather a solubilization in part, in cooperation with the physical development thereof in adjacent color providing layers only, and transport of that left-over silver halide to said adjacent layers, only, to ultimately provide, via oxidative coupling with the pphenylene diamine oxidation product from such physical development of silver ions on to pre-existing development nuclei, a permanent non-diffusible dye record of that positive silver halide record from non-diffusible color former adjacent only to those areas in the silver halide record layer not exposed to light and not in the silver halide layer itself as in more conventional reversal films.
  • FIG. 4 shows by arrows the only intranegative transports allowed in reaction aided silver ion diffusion.
  • FIG. 5 shows the fully developed photosensitive package after shortstop, bleach, fix and wash or stabilizing baths deemed necessary for the system involved rendering a true positive color reproduction of the original scene as regards hue, saturation, and density variations.
  • the single layer emulsion elements 2, 5 and 8 as in FIG. l are actually composed of 3 layers each as in FIG. 2B; 10 representing the silver halide emulsion layer containing also a white coupler to be described below, and in which the silver halide is sensitized to red light when FIG. 28 represents layer 2; is sensitized to green light when FIG. 28 represents layer 5; and is sensitive to blue light when FIG. 2B represents layer 8 in FIG. I.
  • layer 10 is flanked on both sides by thin gelatin layers (11) and (12), (less than 1.0 microns) containing well known hydroquinone derivatives which are commonly used as scavengers to react with any oxidized p-phenylene diamine developer seeking to leave layer 10.
  • the exposed photosensitive package is subjected to but one alkaline processing solution containing at least a p-phenylene diamine type developer and a silver halide solvent at that concentration critical to the promotion of reaction aided silver ion diffusion.
  • the negative image development of light struck silver halide by the p-phenylene diamine type developer occurs simultaneously with the transport of non-latent image bearing silver halide, in part due to solubilization, in part due to reaction providing adjacent sinks, as in the first embodiment, to provide the same final result shown in FIG. 5 after shortstop, bleach, fix and wash steps.
  • oxidized p-phenylene diamine is produced in emulsion members 2, 5 and 8 which must be scavenged and not allowed to leave said members.
  • this scavenging step is provided by the flanking layers 11 and 12 in FIG. 2B.
  • this scavenging step is provided by reaction of this unwanted oxidized developer with socalled white couplers.
  • White couplers which are well known in the art (see, for example, On The Chemistry of White Couplers by W. Puschel, Mitt. Forshunglab. AGFA Leverkusen- Muenchen 4, 352-67 (1964) reaction with oxidized p-phenylene diamine to yield colorless substances thought to be stable leuco dyes.
  • a white coupler such as, but not limited to, color former IV in FIG. 6 is useful in this embodiment.
  • This second embodiment embraces all the advantages of the first embodiment plus the further advantage of requiring but a single developer bath to yield a positive dye record.
  • Support 2 A bromoiodo photographic emulsion with a silver coating weight of 1.0 grams/square meter.
  • a gelatin matrix containing Carey-Lea silver and the non-diffusible cyan forming color former shown as I in FIG. 6 (or any other non-diffusible cyan forming color former including those so-called lipophilic color formers well known to the art which may be in cluded in coated layers as dispersions in a high boiling organic solvent).
  • This color former is coated to a coating weight of 0.5 grams/square meter.
  • the Carey-Lea silver is coated to a weight of 0.05 grams/square meter.
  • the photosensitive element is exposed and processed as in Example I. Inspection showed a blank piece of film with no cyan positive reproduction of the original wedge as in Example I. Examination of an unbleached element, subjected to all the other steps, showed a silver negative reproduction of the wedge, indicating that the Liquadol was operative but the developer 1 was not operative between the silver ion source (layer 2) and a color providing layer some 5.0 microns away in this example (layer 4).
  • EXAMPLE III The photosensitive element in Example II is exposed, developed in Liquadol, followed by a treatment in developer 2 which has the same composition as developer 1, except insofar as the concentration of sodium thiosulfate is increased from 0.5 grams/liter to 3.0 grams/- liter. The element is then shortstopped, bleached, fixed, washed and dried. Inspection of the dried element shows a cyan colored positive reproduction of the original wedge, indicating that a silver transport mechanism has become operative at this higher silver solvent concentration across the 5.0 micron spacing layer.
  • a support 2 A bromoiodo emulsion layer as in layer 2, Example 1, except insofar as it is sensitized to red light by any sensitizing dye known to the art.
  • the element is exposed to actinic radiation through a target containing blue patches and red patches, developed in Liquadol, then treated with no further exposure to light with developer 1 of Example I, shortstopped, bleached, fixed and washed. Inspection of the dried element showed pure yellow image in those areas exposed to red patches and pure cyan image in those areas exposed to blue patches indicating that a silver transport mechanism was operative between layers 2 and 3; and layers 6 and 5; but inoperative between layers 2 and 5; and layers 6 and 3.
  • EXAMPLE V A multicolor photosensitive element of Example IV is exposed and treated as it was in Example IV, except insofar as the higher silver solvent developer 2 is substituted for developer 1. Inspection of the dried element showed yellow image tainted with cyan in those areas exposed to the red patches, and cyan image tainted with yellow in those areas exposed to the blue patches, indicating that all possible silver transport mechanisms are operating at this level, wanted and unwanted; that is to say, silver transport mechanisms between layers 2 and 3; layers 2 and layers 6 and 5; and between layers 6 and 3.
  • a support 2 A bromoiodo emulsion layer identical to layer 2, Example IV which serves as the red record.
  • This layer serves co-jointly as a magenta color providing layer and to maintain the spacing requirements learned from the other examples.
  • magenta providing layer identical to layer 4 in composition, structure, and role (optionally layer 6 or layer 4, but not both, may be identical to layer 4, Example IV without obviating the intent of the invention).
  • the photosensitive package is exposed to actinic radiation through a target containing red, green, blue, cyan, magenta, and yellow patches plus a neutral density photographic wedge.
  • the so exposed package is developed first in Liquadol developer and thereafter with no further exposure to light is treated in developer 1 of Example I. It is then shortstopped, bleached, fixed, washed and dried. Inspection of the dried package shows a fine grained positive color reproduction of the original target with no color contamination.
  • a support 2 A bromoiodo emulsion layer as in layer 2 of Example 6 except insofar as it also includes the white coupler IV, FIG. 6 (or any other colorless coupler known to the art) and which serves as the red record.
  • Example Vl A layer identical to layer 3 of Example Vl which serves as the cyan color providing layer.
  • Example VI A layer identical to layer 4 of Example VI which serves as a magenta color providing layer and as a spacing layer to realize the teachings of our intention.
  • magenta color providing layer identical in content and structure to layer 5, this example.
  • the photosensitive package is exposed to actinic radiation through a target containing red, green, blue, cyan, magenta and yellow patches plus a neutral density sensitometric wedge.
  • the so exposed package is developed but once, in developer 1, shortstopped, bleached, fixed, washed and dried. Inspection of the dried package shows a fine grained positive color reproduction of the original target with no color contamination.
  • a photographic element for producing positive multi-color images by exposure, development and treatment with an alkaline processing solution containing a silver halide solvent and a p-phenylenediamine color developer comprising a support, at least two light-sensitive silver halide emulsion layers carried by said support, each said emulsion layer being sensitized to a different primary color, and a nucleating layer adjacent to and associated with each said emulsion layer, each said nucleating layer comprising (a) a colorless non-diffusible color former capable of forming a color complementary to said primary color of said associated emulsion layer by coupling with the oxidation product of a p-phenylenediamine color developer, and (b) development nuclei for catalyzing the reduction of silver halide transferred into said nucleating layer, the distances between each said emulsion layer and the nucleating layers in the photographic element being a function of the silver halide solvent concentration in the alkaline processing solution used in subsequent treatment of the
  • each nucleating layer is less than 3 microns away from its associated emulsion layer and at least 3 microns away from other emulsion layers.
  • each nucleating layer is located to 1.0 micron away from its associated emulsion layer.
  • each nucleating layer is 3-6 microns away from said other emulsion layers.
  • a photographic element for producing positive multi-color images by exposure and development with an alkaline processing solution containing a silver halide solvent and a p-phenylenediamine color developer comprising a support; at least two light-sensitive silver halide emulsion layers carried by said support, each said emulsion layer being sensitized to a different primary color; a nucleating layer adjacent to and associated with each said emulsion layer, each said nucleating layer comprising (a) a colorless non-diffusible color former capable of forming a color complementary to said primary color of said associated emulsion layer by coupling with the oxidation product of a pphenylenediamine color developer, and (b) development nuclei for catalyzing the reduction of silver halide transferred into said nucleating layer, the distances between each said emulsion layer and the nucleating layers in the photographic element being a function of the silver halide solvent concentration in the alkaline processing solution used in subsequent treatment of the element, said distances being
  • said scavenging means further includes a white coupler or anti-oxidant incorporated in a scavenging layer, and a said scavenging layer is interposed directly between each said emulsion layer and any other layer.
  • each nucleating layer is located 0 to 1.0 micron away from its associated emulsion layer.
  • each nucleating layer is 3-6 microns away from said other emulsion layers.
  • a process for producing positive multi-color images from the photographic element of claim 1, said photographic element having been imagewise exposed to actinic radiation which comprises developing said element with a black and white developer to convert light exposed silver halide to metallic silver and thereby form a negative, and physically developing said negative with an alkaline processing solution comprising a p-phenylenediamine color developer and a silver halide solvent, the concentration of said silver halide solvent being not more than 2 grams per liter and effective, in combination with the relative distances between the emulsion layers and the nucleating layers, to transport unexposed silver halide from an emulsion layer to only its associated nucleating layer, whereby said transported unexposed silver halide is catalytically reduced by said p-phenylenediamine color developer and said colorless color former couples with the oxidation product of the p-phenylenediamine color developer to form positive color images in said nucleating layers.
  • each nucleating layer is located 0 to 1.0 micron away from its associated emulsion layer.
  • each nucleating layer is 3-6 microns away from said other emulsion layers.
  • a process for producing positive multi-color images from the photographic element of claim 11, said photographic element having been imagewise exposed to actinic radiation which comprises directly forming said positive multicolor images by treating said element with an alkaline processing solution comprising a pphenylenediamine color developer and a silver halide solvent, the concentration of said silver halide solvent being not more than 2 grams per liter and effective, in combination with the relative distances between the emulsion layers and the nucleating layers, to transport unexposed silver halide from an emulsion layer to only its associated nucleating layer, whereby said transported unexposed silver halide is catalytically reduced by said p-phenylenediamine color developer and said colorless color former couples with the oxidation product of the p-phenylenediamine color developer to form positive color images in said nucleating layers.
  • said scavenging means further includes a white coupler or anti-oxidant incorporated in a scavenging layer, and a said scavenging layer is interposed directly between each said emulsion layer and any other layer.
  • each nucleating layer is located 0 to 1.0 micron away from its associated emulsion layer.
  • each nucleating layer is 3-6 microns away from said other emulsion layers.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US00280426A 1972-08-14 1972-08-14 Photographic color process based on controlled flow of silver ions Expired - Lifetime US3837854A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00280426A US3837854A (en) 1972-08-14 1972-08-14 Photographic color process based on controlled flow of silver ions
CA176,132A CA998553A (en) 1972-08-14 1973-07-10 Photographic color process based on controlled flow of silver ions
GB3417973A GB1440091A (en) 1972-08-14 1973-07-18 Photographic elment and a colour process based on controlled flow of silver ions
JP48090817A JPS5041535A (cs) 1972-08-14 1973-08-13
IT27840/73A IT998358B (it) 1972-08-14 1973-08-13 Procedimento fotografico a colori basato su un flusso controllato di ioni argento
DE19732340889 DE2340889A1 (de) 1972-08-14 1973-08-13 Verfahren zur herstellung von positiven photographischen farbreproduktionen
FR7329740A FR2196483B1 (cs) 1972-08-14 1973-08-14
BE134575A BE803606A (fr) 1972-08-14 1973-08-14 Procede de coloration photographique reposant sur une circulation controlee des ions argent

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US00280426A US3837854A (en) 1972-08-14 1972-08-14 Photographic color process based on controlled flow of silver ions

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JP (1) JPS5041535A (cs)
BE (1) BE803606A (cs)
CA (1) CA998553A (cs)
DE (1) DE2340889A1 (cs)
FR (1) FR2196483B1 (cs)
GB (1) GB1440091A (cs)
IT (1) IT998358B (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036643A (en) * 1973-06-11 1977-07-19 Gaf Corporation Diffusion transfer color process using lactone or sultone ring containing lipophilic non-diffusing color formers which yield diffusing dyes
US4060417A (en) * 1974-04-30 1977-11-29 Polaroid Corporation Diffusion transfer elements comprising color-providing compounds capable of cleavage upon reaction with silver ions and silver ion barrier layers
EP0003376A1 (en) * 1978-01-27 1979-08-08 Agfa-Gevaert N.V. Photographic material suited for the production of multicolour images by means of diffusion transfer of complexed silver halide
US4267255A (en) * 1979-04-24 1981-05-12 Polaroid Corporation Novel photographic processing composition
US5262286A (en) * 1992-07-31 1993-11-16 Eastman Kodak Company Reduction of yellow stain in photographic prints

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428054A (en) * 1945-08-30 1947-09-30 Eastman Kodak Co Photographic color correction using colored couplers
US2665986A (en) * 1939-11-02 1954-01-12 Gevaert Photo Prod Nv Process of producing colored reversal images
US2688539A (en) * 1951-11-08 1954-09-07 Gen Aniline & Film Corp Integral masking of photographic silver halide emulsions arranged in contiguous layers and containing colorless color formers and azo substituted coupling components
US3476560A (en) * 1964-07-28 1969-11-04 Fuji Photo Film Co Ltd Inhibiting fogging action during color development

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665986A (en) * 1939-11-02 1954-01-12 Gevaert Photo Prod Nv Process of producing colored reversal images
US2428054A (en) * 1945-08-30 1947-09-30 Eastman Kodak Co Photographic color correction using colored couplers
US2688539A (en) * 1951-11-08 1954-09-07 Gen Aniline & Film Corp Integral masking of photographic silver halide emulsions arranged in contiguous layers and containing colorless color formers and azo substituted coupling components
US3476560A (en) * 1964-07-28 1969-11-04 Fuji Photo Film Co Ltd Inhibiting fogging action during color development

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036643A (en) * 1973-06-11 1977-07-19 Gaf Corporation Diffusion transfer color process using lactone or sultone ring containing lipophilic non-diffusing color formers which yield diffusing dyes
US4060417A (en) * 1974-04-30 1977-11-29 Polaroid Corporation Diffusion transfer elements comprising color-providing compounds capable of cleavage upon reaction with silver ions and silver ion barrier layers
EP0003376A1 (en) * 1978-01-27 1979-08-08 Agfa-Gevaert N.V. Photographic material suited for the production of multicolour images by means of diffusion transfer of complexed silver halide
US4269924A (en) * 1978-01-27 1981-05-26 Agfa-Gevaert N.V. Photographic material suited for the production of multicolor images by means of diffusion transfer of complexed silver halide
US4267255A (en) * 1979-04-24 1981-05-12 Polaroid Corporation Novel photographic processing composition
US5262286A (en) * 1992-07-31 1993-11-16 Eastman Kodak Company Reduction of yellow stain in photographic prints

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FR2196483A1 (cs) 1974-03-15
IT998358B (it) 1976-01-20
FR2196483B1 (cs) 1977-05-13
DE2340889A1 (de) 1974-02-28
GB1440091A (en) 1976-06-23
BE803606A (fr) 1973-12-03
CA998553A (en) 1976-10-19
JPS5041535A (cs) 1975-04-16

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